Charna Halpern has been teaching performers how to work together for more than 25 years. Having founded the world famous iO in Chicago and Hollywood, Halperns theaters are the meccas of training in the art of improvisation and act as a recruiting stop for television shows like Saturday Night Live, Late Night with Conan OBrien, The Daily Show, The Colbert Report and MADtv, supplying Hollywood with writers and performers. She is the author of the improv training manuals Truth in Comedy and Art By Committee.